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5. Which of the following is a proportion?
A. 25:36 = 5:6 B.2:3 = 18:30 C. 4:5 = 28:35
D. 16:20 = 4:6
6. Which of the following is not a proportion?
A.5:6 = 25:30 B. 3:8 = 21:56 C.5:9 = 45:72
C. 3:5 = 6:10​